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vfs: de-crapify "cp_new_stat()" function 

It's an unreadable mess of 32-bit vs 64-bit #ifdef's that mostly follow
a rather simple pattern.

Make a helper #define to handle that pattern, in the process making the
code both shorter and more readable.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2012-05-06 17:47:30 -07:00
parent d48b97b403
commit a52dd971f9
1 changed files with 14 additions and 18 deletions
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32
fs/stat.c
View File

@ -190,24 +190,28 @@ SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, stat
#endif /* __ARCH_WANT_OLD_STAT */ #endif /* __ARCH_WANT_OLD_STAT */
#if BITS_PER_LONG == 32
# define choose_32_64(a,b) a
#else
# define choose_32_64(a,b) b
#endif
#define valid_dev(x) choose_32_64(old_valid_dev,new_valid_dev)(x)
#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
{ {
struct stat tmp; struct stat tmp;
#if BITS_PER_LONG == 32 if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
return -EOVERFLOW; return -EOVERFLOW;
#else #if BITS_PER_LONG == 32
if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev)) if (stat->size > MAX_NON_LFS)
return -EOVERFLOW; return -EOVERFLOW;
#endif #endif
memset(&tmp, 0, sizeof(tmp)); memset(&tmp, 0, sizeof(tmp));
#if BITS_PER_LONG == 32 tmp.st_dev = encode_dev(stat->dev);
tmp.st_dev = old_encode_dev(stat->dev);
#else
tmp.st_dev = new_encode_dev(stat->dev);
#endif
tmp.st_ino = stat->ino; tmp.st_ino = stat->ino;
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
return -EOVERFLOW; return -EOVERFLOW;
@ -217,15 +221,7 @@ static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
return -EOVERFLOW; return -EOVERFLOW;
SET_UID(tmp.st_uid, stat->uid); SET_UID(tmp.st_uid, stat->uid);
SET_GID(tmp.st_gid, stat->gid); SET_GID(tmp.st_gid, stat->gid);
#if BITS_PER_LONG == 32 tmp.st_rdev = encode_dev(stat->rdev);
tmp.st_rdev = old_encode_dev(stat->rdev);
#else
tmp.st_rdev = new_encode_dev(stat->rdev);
#endif
#if BITS_PER_LONG == 32
if (stat->size > MAX_NON_LFS)
return -EOVERFLOW;
#endif
tmp.st_size = stat->size; tmp.st_size = stat->size;
tmp.st_atime = stat->atime.tv_sec; tmp.st_atime = stat->atime.tv_sec;
tmp.st_mtime = stat->mtime.tv_sec; tmp.st_mtime = stat->mtime.tv_sec;